Commissioning
4.5 Safe Torque Off Commissioning Test
After installation and before first operation, perform a
commissioning test of the installation, using Safe Torque
Off.
Perform the test again after each modification of the
installation or application involving the STO.
NOTICE
4
4
A succesful commissioning test of the STO function is
required after the initial installation, and after each
subsequent change to the installation.
4.5.1 Restart Prevention for STO
Application
Application where 5-19 Terminal 37 Safe Stop is set to
default value [1]* Safe Stop Alarm , or combined Safe
Torque Off and MCB 112 where 5-19 Terminal 37 Safe Stop
is set to [6] PTC 1 & Relay A or [9] PTC 1 & Relay W/A):
1.
Remove the 24 V DC voltage supply to terminal
37 using the interrupt device while the frequency
converter drives the motor (that is mains supply
is not interrupted).
2.
Check that:
•
•
•
3.
Reapply 24 V DC to terminal 37.
4.
Ensure that the motor remains in the coasted
state, and the mechanical brake (if connected)
remains activated.
5.
Send reset signal (via Bus, Digital I/O, or [Reset]
key).
6.
Ensure that the motor becomes operational
again.
The commissioning test is successfully completed when all
the above steps are passed.
10
VLT
the motor reacts with a coast,
the mechanical brake is activated (if
connected), and
the alarm Safe Stop [A68] is displayed in
the local control panel (LCP), if
mounted.
®
Frequency Converters - Safe Torque Off Operating Instructions
4.5.2 Automatic Restart of Safe Torque Off
Application
Application where 5-19 Terminal 37 Safe Stop is set to [3]
Safe Stop Warning , or combined Safe Torque Off and MCB
112 where 5-19 Terminal 37 Safe Stop is set to [7] PTC 1 &
Relay W or [8] PTC 1 & Relay A/W):
1.
Remove the 24 V DC voltage supply to terminal
37 by the interrupt device while the frequency
converter drives the motor (that is mains supply
is not interrupted).
2.
Check that:
3.
Reapply 24 V DC to terminal 37.
4.
Ensure that the motor becomes operational
again.
The commissioning test is successfully completed when all
the above steps are passed.
NOTICE
See the warning on the restart behaviour in
chapter 2.3 Safety Precautions.
4.6 System Configuration Security
•
Security measures are the responsibility of the
user
•
The frequency converter parameters can be
password-protected
4.7 Service and Maintenance
No maintenance of the Safe Torque Off (STO) functionality
is needed.
MG37D102 - Rev. 2013-11-15
•
the motor reacts with a coast,
•
the mechanical brake is activated (if
connected), and
•
the alarm Safe Stop [A68] is displayed in
the local control panel (LCP), if mounted
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